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HT45R2K-C Datenblatt(PDF) 14 Page - Holtek Semiconductor Inc |
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HT45R2K-C Datenblatt(HTML) 14 Page - Holtek Semiconductor Inc |
14 / 105 page Rev. 1.40 14 �a��� 1�� �01� Rev. 1.40 1� �a��� 1�� �01� HT45R2K-C/-B/-A Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale HT45R2K-C/-B/-A Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale System Architecture Akeyfactorinthehigh-performancefeaturesoftheHoltekrangeofmicrocontrollersisattributed totheinternalsystemarchitecture.Therangeofdevicestakeadvantageoftheusualfeaturesfound withinRISCmicrocontrollersprovidingincreasedspeedofoperationandenhancedperformance. Thepipeliningschemeisimplementedinsuchawaythatinstructionfetchingandinstruction executionareoverlapped,henceinstructionsareeffectivelyexecutedinonecycle,withthe exceptionofbranchorcallinstructions.An8-bitwideALUisusedinpracticallyalloperations oftheinstructionset.Itcarriesoutarithmeticoperations,logicoperations,rotation,increment, decrement,branchdecisions,etc.Theinternaldatapathissimplifiedbymovingdatathroughthe AccumulatorandtheALU.CertaininternalregistersareimplementedintheDataMemoryand canbedirectlyorindirectlyaddressed.Thesimpleaddressingmethodsoftheseregistersalong withadditionalarchitecturalfeaturesensurethataminimumofexternalcomponentsisrequiredto provideafunctionalI/OandA/Dcontrolsystemwithmaximumreliabilityandflexibility. Clocking and Pipelining Thesystemclock,derivedfromanRCoscillatorissubdividedintofourinternallygenerated non-overlappingclocks,T1~T4.TheProgramCounterisincrementedatthebeginningoftheT1 clockduringwhichtimeanewinstructionisfetched.TheremainingT2~T4clockscarryoutthe decodingandexecutionfunctions.Inthisway,oneT1~T4clockcycleformsoneinstructioncycle. Althoughthefetchingandexecutionofinstructionstakesplaceinconsecutiveinstructioncycles,the pipeliningstructureofthemicrocontrollerensuresthatinstructionsareeffectivelyexecutedinone instructioncycle.TheexceptiontothisareinstructionswherethecontentsoftheProgramCounter arechanged,suchassubroutinecallsorjumps,inwhichcasetheinstructionwilltakeonemore instructioncycletoexecute. Forinstructionsinvolvingbranches,suchasjumporcallinstructions,twoinstructioncyclesare requiredtocompleteinstructionexecution.Anextracycleisrequiredastheprogramtakesone cycletofirstobtaintheactualjumporcalladdressandthenanothercycletoactuallyexecutethe branch.Therequirementforthisextracycleshouldbetakenintoaccountbyprogrammersintiming sensitiveapplications. T1 T2 T3 T4 T1 T2 T3 T4 T1 T2 T3 T4 Fe tc h IN ST ( PC ) Ex ec ut e IN ST ( PC -1 ) Fe tc h IN ST ( PC +1 ) Ex ec ut e IN ST ( PC ) Fe tc h IN ST ( PC +2 ) Ex ec ut e IN ST ( PC +1 ) PC PC +1 PC +2 O sci ll at or C lo ck (S yst em C lo ck) P has e Cl o ck T1 Pr og ra m C oun te r P has e Cl o ck T2 P has e Cl o ck T3 P has e Cl o ck T4 Pi pel in in g S y st em C lo ck in g a nd P i p e lin in g |
Ähnliche Teilenummer - HT45R2K-C_15 |
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Ähnliche Beschreibung - HT45R2K-C_15 |
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